python之路《模块》

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1.time模块

FUNCTIONS

    asctime(...)

        asctime([tuple]) -> string

        Convert a time tuple to a string, e.g. ‘Sat Jun 06 16:26:11 1998‘.

        When the time tuple is not present, current time as returned by localtime()

        is used.

    clock(...)

        clock() -> floating point number

        Return the CPU time or real time since the start of the process or since

        the first call to clock().  This has as much precision as the system

        records.

    ctime(...)

        ctime(seconds) -> string

        Convert a time in seconds since the Epoch to a string in local time.

        This is equivalent to asctime(localtime(seconds)). When the time tuple is

        not present, current time as returned by localtime() is used.

    get_clock_info(...)

        get_clock_info(name: str) -> dict

        Get information of the specified clock.

    gmtime(...)

        gmtime([seconds]) -> (tm_year, tm_mon, tm_mday, tm_hour, tm_min,

                               tm_sec, tm_wday, tm_yday, tm_isdst)

        Convert seconds since the Epoch to a time tuple expressing UTC (a.k.a.

        GMT).  When ‘seconds‘ is not passed in, convert the current time instead.

        If the platform supports the tm_gmtoff and tm_zone, they are available as

        attributes only.

    localtime(...)

        localtime([seconds]) -> (tm_year,tm_mon,tm_mday,tm_hour,tm_min,

                                  tm_sec,tm_wday,tm_yday,tm_isdst)

        Convert seconds since the Epoch to a time tuple expressing local time.

        When ‘seconds‘ is not passed in, convert the current time instead.

    mktime(...)

        mktime(tuple) -> floating point number

        Convert a time tuple in local time to seconds since the Epoch.

        Note that mktime(gmtime(0)) will not generally return zero for most

        time zones; instead the returned value will either be equal to that

        of the timezone or altzone attributes on the time module.

    monotonic(...)

        monotonic() -> float

        Monotonic clock, cannot go backward.

    perf_counter(...)

        perf_counter() -> float

        Performance counter for benchmarking.

    process_time(...)

        process_time() -> float

        Process time for profiling: sum of the kernel and user-space CPU time.

    sleep(...)

        sleep(seconds)

        Delay execution for a given number of seconds.  The argument may be

        a floating point number for subsecond precision.

    strftime(...)

        strftime(format[, tuple]) -> string

        Convert a time tuple to a string according to a format specification.

        See the library reference manual for formatting codes. When the time tuple

        is not present, current time as returned by localtime() is used.

        Commonly used format codes:

        %Y  Year with century as a decimal number.

        %m  Month as a decimal number [01,12].

        %d  Day of the month as a decimal number [01,31].

        %H  Hour (24-hour clock) as a decimal number [00,23].

        %M  Minute as a decimal number [00,59].

        %S  Second as a decimal number [00,61].

        %z  Time zone offset from UTC.

        %a  Locale‘s abbreviated weekday name.

        %A  Locale‘s full weekday name.

        %b  Locale‘s abbreviated month name.

        %B  Locale‘s full month name.

        %c  Locale‘s appropriate date and time representation.

        %I  Hour (12-hour clock) as a decimal number [01,12].

        %p  Locale‘s equivalent of either AM or PM.

        Other codes may be available on your platform.  See documentation for

        the C library strftime function.

    strptime(...)

        strptime(string, format) -> struct_time

        Parse a string to a time tuple according to a format specification.

        See the library reference manual for formatting codes (same as

        strftime()).

        Commonly used format codes:

        %Y  Year with century as a decimal number.

        %m  Month as a decimal number [01,12].

        %d  Day of the month as a decimal number [01,31].

        %H  Hour (24-hour clock) as a decimal number [00,23].

        %M  Minute as a decimal number [00,59].

        %S  Second as a decimal number [00,61].

        %z  Time zone offset from UTC.

        %a  Locale‘s abbreviated weekday name.

        %A  Locale‘s full weekday name.

        %b  Locale‘s abbreviated month name.

        %B  Locale‘s full month name.

        %c  Locale‘s appropriate date and time representation.

        %I  Hour (12-hour clock) as a decimal number [01,12].

        %p  Locale‘s equivalent of either AM or PM.

        Other codes may be available on your platform.  See documentation for

        the C library strftime function.

    time(...)

        time() -> floating point number

        Return the current time in seconds since the Epoch.

        Fractions of a second may be present if the system clock provides them.

2.random

 详细信息

 1 help(random) 

我们先分析几个常见的

# 1.随机数0到1之间取
print(random.random())
# 2.随机整数
print(random.randint(0, 2))
# 3.随机整数左闭右开
print(random.randrange(0, 6))
# 随机选值  字符穿数组元组都行
print(random.choice(‘hello‘))
# 规定长度去浮点数
print(random.uniform(0, 9))
# 洗牌功能
name = [1, 2, 3, 4, 5, 6]
random.shuffle(name)
print(name)

现在我将我们学的内容实现一个现实生活的问题

出现随机验证码

check_code = ‘‘
for i in range(0, 4):     
    temp = random.randrange(0, 4)   
    if i == temp:   
        code1 = random.randint(0, 9)   # 当i与temp相同时随机数在0到九之间
    else:
        code1 = chr(random.randint(97, 122))  # 否则就为字母
    check_code += str(code1)
print(check_code)

3.os模块

python之路《模块》

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原文地址：https://www.cnblogs.com/BookMiki/p/9697324.html